Lawn-mower sharpener.



No- 808,434. PATENTED DEC. 26, 1905. J. GHESBRO.

LAWN MOWER SHARPENER.

APPLICATION FILED FEB-4.1905.

2 SHEETSSHEET 1.

WITNESSES .INVENTOR zmhi PATENTED DEC. 26, 1905.

J. GHESBRO.

LAWN MOWER SHARPENBR.

APPLICATION FILED FEBA. 1905.

2 SHEETS-$312111 2.

[N VENT 0R WITNESSES 650 1 W4 @yMM Un rno STATES PATENT @FFIQE.

LAWN-MOWER SHARPENER.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed February 4, 1905. Serial No. 244,236-

To aZZ whom, it may concern:

Be it known that I, JOHN GHEsBRo, a citizen of the United States, and a resident of Oneonta, in the county of Otsego and State of New York, have made a certain new and useful Invention in Lawn-Mower Sharpeners; and I declare the following to be a full, clear, and eXact description of the same, such as will enable others skilled in the art to which it appertains to make and use the invention, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

Figure l is a cross-section of a lawn-mower having my invention applied to the rigid knife thereof. Fig. 2 is a similar view showing the invention supported by the brace-rod of the mower. Fig. 3 is a detail perspective view of one form of my invention. Fig. 4: is a similar view of the other form of my invention. Fig. 5 shows in detail the means for adjusting the sharpening-bar of the form of the invention applied to the brace-rod of the mower. Figs. 6 and 7 show in detail the means for adjusting the sharpening-bar of the form of the invention applied to the rigid knife of the mower.

The invention is designed to provide an attachment for facilitating sharpening the blades of the rotary knife of a lawn-mower during their rotation in an automatic manner; and it consists in the novel construction and combinations of parts, as hereinafter set forth.

In the accompanyingdrawings, illustrating the invention, the letter a designates a metallic frame-plate of about the length of the rigid knife of the mower and comparatively narrow in width, such plate having its ends I) bent in loop form and terminating in short reverselybent flanges c. In this frame is inclosed and secured the emery stick or Whetstone or filef, the length of which corresponds to that of the frame a. This frame-plate is provided with means of fastening to the mower, which may consist of upward-extending arms g of hook form, having eacha clamp-screw it for engagement with the brace-rod Z of the mower, in front and above the center of the rotary knives. This device is also provided with a tilting or adjusting arm 1) of similar form to the arms g and having also a clamp-screw Q for engagement with said brace-rod. A second set-screw r is provided in the lower end of the arm 39 for engagement with the frameplate a to tilt or adjust the same. In this adjustment the arm 19 is first clamped to bracerod Z, the arms g being loose upon said rod. Adjustment of the set-screw a will thus force the frame-plate a forward to the desired degree. This having been effected, the frameplate a is fixed by adjustment of the clampscrews Zr. l/Vhen the device has been adjusted, the lawn-mower is pushed forward for a short distance and during this movement its knives rotating against the sharpening-bar f are ground to a sharp edge.

When it is desired to use the rigid knifebar of the mower as the support for the frameplate or emery-stick holder, the handle of the mower is turned backward and the rotary knives raised into the position shown in Fig. 1 of the drawings. The frame-plate a, with its sharpening-bar, is then slipped upon the rigid knife 3, a sufiicient interval being allowed between the end flangesc and the back of said plate to admit such rigid knife and to allow for adjustment of the sharpening-bar, as shown in detail in Figs. 6 and 7 of the drawings.

In adjusting the sharpening-bar to the knife the end clamp-screws t of the frame are loosened sufficiently to allow the frame a to he slipped on the rigid knife .9. The set-screw 20, carried by the loop, form attachment 2; of the frame-plate a and engaging in this case the holder to of the rigid knife is then adjusted to give the frame a and its sharpeningbar the proper inclination for sharpening purposes. The screws t are then tightened to clamp the sharpening-bar in position.

The revolution of the rotary knives of the mower for a short time will thus accomplish the desired result.

Having described the invention, what I claim, and desire to secure by Letters Patent,

1. In a lawn-mower-sharpening device, the combination, of a sharpening device including a frame-plate having short reversely-bent end portions, a sharpening-blade inclosed by said plate, and an adjusting-screw for said blade engaging said plate, substantially as specified.

2. In a lawn-Inower-sharpening device, the combination of depending arms pivotally connected with the brace-bar of the mower in front and above the center of the rotary knives and carrying the sharpening-blade at their lower ends, and means for adjusting the pressure of said blade to the rotary knives, substantially as specified.

3. In a lawn-mower-sharpening device, the combination of depending suspension-arms pivotally connected at their upper ends With In testimony WhereofI aflix my signaturein the brace-bar of the mower in front and above presence of two Witnesses.

the center of the rotary knives, and carrying the sharpening-blade at their lower ends, a

fixed arm connected to said brace-bar at its Witnesses: upper end, and an adjusting-screw engaging GEO. VVOI-ILLEBEN, said fixed arm, substantially as specified. i B. W. HOYE.

JOHN OHESBRO. 

